Rizal compliments Blumentritt with a copy of Rufino Baltazar Hernández,
Aritmética, written in Tagalog and Spanish.

11 Obere Neckar Strasse
Heidelberg, 31 July 1886

Esteemed Professor Ferdinand Blumentritt

Esteemed Sir,

Having heard that Your Lordship is studying our language
and that you have already published some works on the subject,
I take the liberty of sending you a valuable book(1) written
in that language by a countryman of mine. The Spanish version
is mediocre because the author is only a modest writer,
but the Tagalog portion is good and this is precisely the language
spoken in our province.